Siemens 3TH2022-0bb4 Three Phase Industrial Contactor

Siemens 3TH2022-0BB4 is a four‑pole contactor relay (Hilfsschütz) in the SIRIUS 3TH20 family with a 24 V DC coil. It provides two auxiliary contacts (2 NC + 2 NO) alongside four main poles, all in a compact enclosure sized about 45 × 48 × 68 mm with screw-terminal connections and DIN EN 50011 compliance. The coil operates at DC 24 V, and the main contact circuit is rated for 4 A, making it suitable for DC control circuits and light to moderate‑load switching in automation panels. Typical applications include sequencing and interlocking in DC-powered control circuits for industrial equipment and PLC‑driven control in three‑phase motor control panels. The device is cataloged as 3TH2022-0BB4 and is associated with the 22E coil family, reflecting Siemens’ Hilfsschütz designation within the DIN EN 50011 standard.